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Direct torque control is a variable-structure control strategy with simplicity, fast response, and tolerance to motor parameter variation, which provides direct control of stator flux and electromagnetic torque by optimally selecting the inverter states in each sampling period. For five-phase drives, the increased number of voltage vectors offers greater flexibility in optimizing the selection of...
A sensorless induction motor drive, with decoupled control of electromagnetic torque and of stator flux, has been developed. The performance of the proposed speed estimator has been deeply investigated through both simulation and experimental analyses, in an extended speed range, from near standstill to the field weakening region. Several experimental results, which have been obtained developing a...
In this paper, a comparison is made between different implementations of the three-level torque comparator for a direct torque control (DTC) based induction motor drive. The DTC scheme controls stator flux and torque by means of hysteresis comparators, respectively a two-level control structure for the stator flux and a three-level comparator for the electromagnetic torque. The standard three-level...
This document presents and validates a new proposed speed vector control of induction motors based on linear GPC (generalized predictive control) law that is used in the speed control loop. In the current loop the presented control scheme incorporates the SVPWM (space vector pulse width modulation) instead of the commonly used GPC regulator: this facilitates the design and reduces the computation...
This paper presented a novel passivity-based fuzzy sliding-mode speed controller to decouple the rotor flux and electromagnetic torque for vector-controlled induction motor drives. According to the passivity of induction motor system, the indirect field oriented control(IFOC) principle was derived and a sliding-mode speed controller was proposed, so the reference current of q-axis can be controlled...
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